/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.iotdb.db.mpp.plan.execution.config.metadata;

import com.google.common.util.concurrent.ListenableFuture;
import com.google.common.util.concurrent.SettableFuture;
import org.apache.iotdb.commons.conf.IoTDBConstant;
import org.apache.iotdb.db.mpp.common.header.ColumnHeader;
import org.apache.iotdb.db.mpp.common.header.DatasetHeader;
import org.apache.iotdb.db.mpp.plan.execution.config.ConfigTaskResult;
import org.apache.iotdb.db.mpp.plan.execution.config.IConfigTask;
import org.apache.iotdb.db.mpp.plan.execution.config.executor.IConfigTaskExecutor;
import org.apache.iotdb.db.mpp.plan.statement.metadata.CountStorageGroupStatement;
import org.apache.iotdb.rpc.TSStatusCode;
import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType;
import org.apache.iotdb.tsfile.read.common.block.TsBlockBuilder;

import java.util.Collections;

public class CountStorageGroupTask implements IConfigTask {

    private final CountStorageGroupStatement countStorageGroupStatement;

    public CountStorageGroupTask(CountStorageGroupStatement countStorageGroupStatement) {
        this.countStorageGroupStatement = countStorageGroupStatement;
    }

    @Override
    public ListenableFuture<ConfigTaskResult> execute(IConfigTaskExecutor configTaskExecutor)
            throws InterruptedException {
        return configTaskExecutor.countStorageGroup(countStorageGroupStatement);
    }

    public static void buildTSBlock(int storageGroupNum, SettableFuture<ConfigTaskResult> future) {
        TsBlockBuilder builder = new TsBlockBuilder(Collections.singletonList(TSDataType.INT32));
        builder.getTimeColumnBuilder().writeLong(0L);
        builder.getColumnBuilder(0).writeInt(storageGroupNum);
        builder.declarePosition();
        ColumnHeader storageGroupColumnHeader =
                new ColumnHeader(IoTDBConstant.COLUMN_COUNT, TSDataType.INT32);
        DatasetHeader datasetHeader =
                new DatasetHeader(Collections.singletonList(storageGroupColumnHeader), true);
        future.set(new ConfigTaskResult(TSStatusCode.SUCCESS_STATUS, builder.build(), datasetHeader));
    }
}
